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Why does C# allow {} code blocks without a preceding statement?
..., does declaring a variable within a block cause the variable to be scoped from the perspective of the run-time? From what I can tell, variables' lifetimes are often not bounded by scoping blocks, a fact which is observable in mixed-language projects if the first thing done with a variable in a loo...
Best practices to handle routes for STI subclasses in rails
... I had to set url explicitly in order for it to both render the from and saves properly. <%= form_for @child, :as => :child, url: @child.becomes(Parent)
– lulalala
May 28 '12 at 6:55
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How can I list ALL DNS records?
...less you control the zone. You'll usually conduct a zone transfer directly from the authoritative server (the @ns1.google.com below) and often from a name server that may not be published (a stealth name server).
# This will return "Transfer failed"
dig @ns1.google.com google.com axfr
If you have...
Read only file system on Android
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adb shell <command> can be used from the computer (if you lack a terminal on your phone)
– Fletcher91
May 19 '14 at 8:38
add a comme...
On Duplicate Key Update same as insert
...UPLICATE KEY
UPDATE a=a, b=b, c=c, d=d, e=e, f=f, g=g;
To get the id from LAST_INSERT_ID; you need to specify the backend app you're using for the same.
For LuaSQL, a conn:getlastautoid() fetches the value.
share
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Selenium WebDriver: Wait for complex page with JavaScript to load
...support for this, however, is horrible. Firefox began to try to support it from FF4 onwards (still evolving), IE has basic support in IE9.
And I guess I could come up with another flawed solution soon. The fact is - there's no definite answer on when to say "now the page is complete" because of th...
What's wrong with using == to compare floats in Java?
...e best answer so far, but it is still flawed. Where do you get the epsilon from?
– Michael Piefel
Apr 27 '15 at 15:34
1
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Why Would I Ever Need to Use C# Nested Classes [duplicate]
...ll as protected of course).
Basically, if you only need to use this class from within the "parent" class (in terms of scope), then it is usually appropiate to define it as a nested class. If this class might need to be used from without the assembly/library, then it is usually more convenient to th...
What is the canonical way to check for errors using the CUDA runtime API?
...n return either errors which occurred during the kernel execution or those from the memory copy itself. This can be confusing for the beginner, and I would recommend using explicit synchronisation after a kernel launch during debugging to make it easier to understand where problems might be arising....
How do I use a PriorityQueue?
... inserts an element if possible, otherwise returning
false. This differs from the Collection.add method, which can fail to
add an element only by throwing an unchecked exception. The offer
method is designed for use when failure is a normal, rather than
exceptional occurrence, for example, i...